Packing material



Aug. 27, 1935.

c. K. DILLINGHAM ET AL PACKING MATERIAL Filed Oct. 15, 1952 ATTORN EYPatented Aug. 27, 1935 UNIT-LED STATES PACKING MATERIAL Charles K.Dillingham, Plainfield, N. .L, and Phillip D. :Cannon, Philadelphia,Pa., assignors to. J ohns-Manville Corporation,

New York,

, N. Y., a corporation of New York Application October 15, 1932, SerialNo. 637,952 1 Claim. (01. 154-455) This invention relates to apackingmaterial and particularly to one adapted for use as a gasket betweenplane surfaces.

The invention comprises a woven, heatresist- 5 ant, gasketing materialcontaining a central pertion woven integrally with the outer portionsand adapted to be more readily penetrated by a conventional fasteningelement than the said outer portions.

The invention is illustrated in the drawing, in which Fig, 1 shows afront view of a preferred form of gasketing tape with the yarn removedfrom some of the reenforcing wires, for clearness of illustration; and

Fig. 2 shows a front View of a similar tape with the central portion cutout at intervals, to

provide open spaces.

In the figures, there is shown a tape with outer portions I adapted tocontact closely with surfaces that are to be packed and a centralportion 2 that is adapted to be penetrated by fastening means, such as'abolt, more readily than the adjacent outer portions.

The outer portions contain both longitudinal or warp strands 3 of yarnand transverse or filling strands 4 interwoven therewith. The centralportion contains a smaller number of strands per unit of area or lengththan the outer portion and, in the embodiment illustrated, containsstrands extending in one direction only, namely, transverse or fillingstrands 4. Furthermore, the filling strands in the form illustrated arespaced farther apart, that is, are less numerous per unit otlength ofthe tape, than are the filling strands in the outer portions.

The yarn used is preferably heat-resistant.

We have used to advantage asbestos yarn which, in the strandsconstituting the warp, is relatively soft and not wire-reenforced, and,in the strands composing the filling, may contain wires 5, such as finebrass wire which is frequently used to reenforce asbestos yarn.

As used, the tape is impregnated with a suitable packing or frictioncompound 6, such as a conventional one containing a large proportion ofrubber and a vulcanizing agent.

To make the insertion of large bolts or fastening means through thecentral portion very convenient, the central portion may be cut out atintervals, to provide the spaces 1 positioned to correspond to thelocations of the bolts or other fastening means in a gasketed assembly.

The method of manufacturing the product of the invention is illustratedbelow, in the case of a gasketing tape suitable for-use in'gasketing thehead plate of a locomotive f a The weaving is done by aloo'm includingin the assembly a yarn beani', two or more harnesses for the warpstrands; a reed, a shuttle, and a cloth beam, in addition to the usualaccessories and driving means. The strands that are to compose the warpin the finished fabric are spacedby the harness mechanism or otherwiseinto two parallel bands that correspond to the outer portions l in thefinished tape, to leave-a space or gap between them, in what is to bethe central portion of the woven product. The filling strands. are wovenwith the spaced bands of Warp yarn. When it is desired to space thefilling strands farther apart in the central than in the outer portions,the outer bands of warp threads maybe alternately depressed or elevatedso that the shuttle carrying the filling yarn engages and interweavesthe filling yarn with the warp yarn in one of the said bands only,during selected passages of the shut-,

For example, the loom'may be operated so that the shuttle weaves thefilling strand with tle.

both of the spaced bands of warp yarns, then with only the right of thesaid bands, then with both bands, then with the left band only, thenwith both bands, and so on, to give a relatively open structure in thecentral part of the tape. considered unnecessary to illustrate the loom,in-' asmuch as it is conventional.

After the tape is woven, it is calendered, to smooth the surfaces andadjust the size and shape, and then is impregnated with suitablematerial of type commonly used to impregnate a gasket or packing. Thusthe tape may be passed through a solution of rubber and vulcanizingagent there- It is for in a volatile'solvent and the volatile,;solventlater removed by evaporation.

When the tape is to be used for gasketing under conditions of elevatedtemperature, it is not necessary tovulcanize the tape before it isinstalled for 7 use, inasmuch as the prevailingtemperature during usewill cause vulcanization. However, if desired, the tape may be subjectedto an elevated temperature for a substantial period of time adapted tocause vulcanization of the rubberbeand serve to hold the outer portionstightly in position. Since they extend practically at a right angle tothe length of the tape, they establish the spacing of the outer portionsof the tape from each other and prevent excessive spreading apart ofthese portions under all circumstances. When the strands in the centralportion are spread apart to allow for the insertion of a bolt or thelike therethrough, the central portion around thebolt stillremains'relativelythin; there is thus provided a distinct advantage overconventional types of tape gasketin which a very'thick portionof thegasket around the fastening bolt may be produced by spreading apartclosely woven gasket material to allow the insertionof the bolttherethrough. The

central portion, as well as other portions in the preferred product, areheat-resistant and, at the same time, are compressible, non-corroding,and resilient.

The details that have been given are for the purpose of illustration andnot restriction, and many variations therefrom may be made withoutdeparting from the spirit and, scope of the invention.

What we claim is:

A packing tape comprising longitudinally extending strips of wovenfabric constituting the outer portions of the tape and filler strandsintegrally woven with the said strips and securing them together inspaced relationship, some of the filler strands extending through thespace between the strips and. being arranged in the said space as a.plurality of series containing each relatively closely spaced strandsand being spaced from the to receive fastening means of the type of abolt.

CHARLES K. DILLINGHANL. PHILLIP D. CANNON;

' next of the said series, to provide a space adapted 20

